Welcome back to the community, @RayRay!
Please be informed that this is not possible with backgroud-audio at the moment. However, you could still use the audio question type to collect individual questions as outlined in the support article:
Please also be informed that these audio questions cannot be made hidden.
However, I am also pinging @lognaturel and @Xiphware if they should have any updates with making a background-audio question type possible for selected questions.
